<template>
    <div>
        <router-link tag="div" to="/" class="header-abs" v-show="showAbs">
            <div class="iconfont header-abs-icon">&#xe625;</div>
        </router-link>
        <div class="header-fixed" v-show="!showAbs" :style="opacityStyle">
            <router-link to="/">
                <div class="iconfont header-fixed-back">&#xe625;</div>
            </router-link>
            景点详情
        </div>
    </div>
</template>

<script>
import CommonGallary from 'common/gallary/Gallary'
export default {
  name: 'DetailHeader',
  data (){
     return {
        showAbs: true,
        opacityStyle:{
            opacity: 0
        }
     }
  },
  methods:{
     handleSctoll (){
         const top =  document.documentElement.scrollTop;
            if(top > 60){
                let opacity = top / 140
                opacity = opacity > 1 ? 1 : opacity
                this.opacityStyle = {
                    opacity
                }
                this.showAbs = false
            } else {
                this.showAbs = true
            }
            console.log(document.documentElement.scrollTop);
     }
  },
  activated (){
    window.addEventListener('scroll',this.handleSctoll)
  },
  deactivated (){
    window.removeEventListener('scroll',this.handleSctoll)
  }
};
</script>

<style lang="stylus" scoped>
@import '~styles/public.styl';
    .header-abs {
        position: absolute;
        left:.2rem;
        top:.2rem;
        width:.8rem;
        height: .8rem;
        text-align: center;
        line-height: .8rem;
        border-radius: .4rem;
        background:rgba(0,0,0,0.8)
    }
    .header-abs-icon {
        color: #fff;
        font-size: .4rem;
    }
    .header-fixed {
    z-index:2
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height:$headerHeight;
    line-height: 0.86rem;
    text-align: center;
    color: #fff;
    background: $bgColor;
    font-size: 0.32rem;
}

.header-fixed-back {
    position: absolute;
    top: 0;
    left: 0;
    color: #fff;
    width: 0.64rem;
    text-align: center;
    font-size: 0.4rem;
}
</style>
